Sporophyte
Diploid phase producing spores by meiosis in plant life cycles.
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A sporophyte is one of the two alternating multicellular phases in the life cycles of plants and algae. It is a diploid multicellular organism that produces asexual spores, alternating with a multicellular haploid gametophyte phase. In seed plants, including gymnosperms and angiosperms, the sporophyte phase is more prominent and is the familiar green plant with roots, stem, leaves, and cones or flowers.
Quick Facts
- Type
- Multicellular phase in life cycles
- Ploidy
- Diploid
- Reproduction
- Produces asexual spores by meiosis
- Alternates with
- Haploid gametophyte phase
- Dependent in
- Bryophytes (mosses, liverworts, hornworts)
Facts from the source article.
Lore & Background
The sporophyte develops from the zygote produced when a haploid egg cell is fertilized by a haploid sperm, giving each sporophyte cell a double set of chromosomes. All land plants and most multicellular algae have life cycles alternating between a multicellular diploid sporophyte and a multicellular haploid gametophyte. In flowering plants, the gametophytes are very reduced, represented by the germinated pollen and the embryo sac.
Reader's Guide
The sporophyte is significant as the phase that produces spores by meiosis, a reduction division that halves chromosome number. This process provides a direct DNA repair capability for dealing with DNA damages, including oxidative damages, in germline reproductive tissues.
The sporophyte's dominance in seed plants underlies the familiar forms of most land vegetation. Its evolutionary history includes the independent evolution of heterospory and endospory during the Devonian period, leading to the development of seeds in gymnosperms and angiosperms. The sporophyte's role in alternation of generations is fundamental to understanding plant reproduction and evolution.
Did You Know?
- In bryophytes, the adult sporophyte is dependent on the dominant gametophyte for nutrition.
- Early land plants had sporophytes that produced identical spores (isosporous), but ancestors of gymnosperms evolved heterosporous life cycles.
Frequently Asked Questions
What is Sporophyte?
Sporophyte is the diploid, multicellular stage in the life cycles of plants and algae. It is the phase dedicated to generating asexual spores through meiosis before the cycle passes to the haploid gametophyte.
What is Sporophyte's role in the life cycle?
Its core job is to produce spores asexually via meiosis, acting as the generational bridge to the next gametophyte. In seed plants—gymnosperms and angiosperms alike—it is the dominant, recognizable green body with roots, stems, leaves, and cones or flowers.
What is the relationship between Sporophyte and Gametophyte?
They are alternating phases within the same life cycle: Sporophyte is diploid and spore-producing, while Gametophyte is haploid and gamete-producing. Which phase is dominant shifts by group—gametophyte-led in bryophytes, but sporophyte-led in ferns, horsetails, and all seed plants.
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Sporophyte (CC BY-SA 4.0).
- Word definitions: the Codexery glossary, each quoted from its Wikipedia article.
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